g_object_set_data_full (G_OBJECT (item), "egg-collate-key",
(gpointer) collate_key, g_free);
g_object_set_data_full (G_OBJECT (item), "egg-item-name",
(gpointer) item_name, g_free);
g_object_set_data_full (G_OBJECT (item), "egg-collate-key",
(gpointer) collate_key, g_free);
g_object_set_data_full (G_OBJECT (item), "egg-item-name",
(gpointer) item_name, g_free);